I bought mold making liquid at Michale's. I used a cheap paint brush to paint on about five coats. After each coat I just put the brush in a zip lock bag. No need to clean it between coatings.I did one a day, but if you use a hair dryer it can go much faster. After the fifth coating I used mosquito netting which I found at Joe Ann Fabric's. 1/4 of a yard gives you a lot. I put on the sixth coat and painted the netting and let set. I added another coat and let it dry over night. Once the mold was ready I used plaster of Paris I purchased from Home Depot in a 50 lb bag. I also found a type of hydrocal plaster at a building supply center. Not a big box store. The stuff I used dried rock hard in about five minutes. It cost about the same as one of those milk cartons you get at the hobby shop and goes a lot further. The best thing to do is make several different molds and pour them all at the same time. I sprayed my molds with soapy water which help release the plaster. You can apply your rocks to your wall as soon as it is about set up. Just hold it in place for a couple minutes until it sets up and peal off the mold.
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